Cooksy, Andrew L. and Blake, Geoffrey A. and Saykally, Richard J. (1986) Direct measurement of the fine-structure interval and g_J factors of singly ionized atomic carbon by laser magnetic resonance. Astrophysical Journal Letters, 305 (2). L89-L92. ISSN 2041-8205 http://resolver.caltech.edu/CaltechAUTHORS:20120913-112214142
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Abstract
We present the results of laser magnetic resonance measurements performed on the ground ^2P state of singly ionized atomic carbon (C_II). The 2^P_(3/2) ← ^2P_(1/2) fine-structure intervals of both ^(12)C^+ and ^(13)C^+ have been determined with a precision of approximately 1 ppm, and the g_J factors to approximately one part in 10^4. Specifically, we find that g_(J=(1/2)) = 0.66576(11) and g_(J=(3/2)) = 1.33412(11), while for ^(12)C^+ ΔE_0(^2P_(3/2) ← ^2P_(1/2))= 1900536.9(1.3) MHz, with ΔE_0(^2P_(3/2) ← ^2P_(1/2)) = 1900545.8(2.1) and ΔE(^2P(3/2) ← ^2P_(1/2), F = 2 ← 1) = 1900466.1(2.3) MHz in ^(13)C^+. The highly precise values of the ^(12)C_II and ^(13)C_II fine-structure intervals verify the already secure far-infrared astronomical identification of C^+ and should allow the interstellar (^(12)C / ^(13)C) ratio to be unambiguously determined in a number of environments.
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| Additional Information: | © 1986 American Astronomical Society. Received 1986 February 3; accepted 1986 March 12. This work was supported by the National Science Foundation, Structure and Thermodynamics Program (grant CHE 8402861). A. Cooksy thanks Chevron for a graduate fellowship, and G. Blake and R. Saykally gratefully acknowledge financial support provided by the Berkeley Miller Research Institute. | ||||||||
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| Subject Keywords: | laboratory spectra; line identification; molecular processes; carbon isotopes; gas ionization; interstellar gas; laser applications; line spectra; magnetic resonance; abundance; far infrared radiation; least squares method; molecular clouds; zeeman effect | ||||||||
| Record Number: | CaltechAUTHORS:20120913-112214142 | ||||||||
| Persistent URL: | http://resolver.caltech.edu/CaltechAUTHORS:20120913-112214142 | ||||||||
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||
| ID Code: | 34064 | ||||||||
| Collection: | CaltechAUTHORS | ||||||||
| Deposited By: | Aucoeur Ngo | ||||||||
| Deposited On: | 13 Sep 2012 18:47 | ||||||||
| Last Modified: | 26 Dec 2012 16:10 |
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